Paper cutter



I July 2-7, 1943. v.0. BELLAR 5 PAPER CUTTER v v 7 Filed Sept-g5 1941 5Sheets-Sheet 1 INVENTOR. 1 OSCAR BELL/JR Jul -27, 1943. o. BELLAR2,325,030

PAPER CUTTER Filed Sept. 26, 1941 5 Sheets-Shee1t 2 R INVENTOR. 9 05cmBaum July 27,1943.- 0. BELLAR I 5 9 0 BAPER CUTT'ER Filed Sept. 26,-1941 5 Sheets-Sheet 3 y 27, 94 o. BELLAR 3 3 3 PAPER CUTTER Filed Sept26, 1941 5 Sheets-Sheet 4 INVENTOR OSCAR Baum Arman);

y 7, 1943- o. BELLAR PAPER CUTTER Filed, Sept. 26, 1941 5 Sheeffs-Sheet5 INVENTOR. 0504/? BQLAR- mN AmNN JEPMVTr L QM BEFH. Q,

' building without disassembling said mechanism Patented July 27, 1943fi l I i v UNITED STATES PA'I'EN'I7- OFF-ICE.

PAPER CUTTER Oscar'BeIIar, Brooklyn, N. Y. Application September as,1941, Serial No. 412,395

w m ss. (c1.164-54)' This invention relates to paper cutters and moreparticularly to power-driven heavy dutyg paper cutting machines. j

One of the objects of my invention is to provide a paper cutter of thecharacter described wherein the driving mechanism and associated devicesfor actuating the knife blade and paper clamp are so arranged that thepaper cutter may be passed through an ordinary doorway of a or devicesor removing thesame from said machine. 7

Another object of my invention is to provide a paper cutter of thecharacter described wherein' the driving mechanism and associateddevices for actuating the knife blade and paper clamp compriserelatively few and simple partsrwhich -are so disposed in the machine asto be' readily accessible for replacement or repair. I

Another object of my invention'is .to provide a paper cutter of thecharacter described wherein no'part of the heavy driving mechanism ishaving a knife blade which cooperates .with the I knife drivingmechanism in such manner that no pressure is exerted against bearingsurfaces which guide the knife in its vertical movement, whereby saidblade constantly remains square to the paper being cut. I

Still an additional object of. my invention is to provide a paper cutterof the character described having an improved, highlycompact,onerevolu'tio'n clutch associated with the driving mechanism.

Another object of my invention is to provide a paper cutter of thecharacter described having disposed behind the base of the supportingframe for the paper cutter so as to-thereby prevent strain or injury topersons working on such heavy mechanisms in cramped or dangerouspositions. t

A further object of my invention is to provide a paper cutter of thecharacter described wherein the driving mechanism and associated devicesfor actuating the paper clamp are disposed at the side of the machineabove the. level of the paper bed and are driven from an end member ofthe driving mechanism which actuate the knife blade. 4

An additional object of my invention is to provide a highly simplifiedand improved driving v out.

train for actuating the knife blade and the paper I clamp are drivenfrom .a. member reciprocably mounted at the side of the cutter. A stillfurther object of my invention is to provide a paper cutter of thecharacter described an overload mechanism for preventing breakage ordamage to any parts of the machine upon the occurrence of an overload,said mechanism being resettable without substitution of any parts afteroverload conditions have been removed.

Another object of my invention is to provide a paper cutter of thecharacter described which shall comprise relatively few and simpleparts, and which shall be rugged in construction and eflicient inoperation to a high degree.

Various other objects of my invention will in part be obvious and inpart hereinafter pointed The invention accordingly consists in thefeatures of construction, combinations of elements, and arrangement ofparts which will bev exemplified in the construction hereinafterdescribed, and of which the scope of application will be indicated inthe claims.

of this invention.

.Fig. 1 is a front view of a paper cutter embodying, my invention withvarious portions thereof broken away to show details of the drivingmechanism and guides for the knife stock; Fig. 2 is a fragmentary sideview thereof, being illustrative of the positioning of the drivingmechanism and associated devices for actuating the knife stock and paperclamp within the confines of the supporting frame for the cutter;

Fig. 3 is a sectional view of the paper cutter taken substantially alongthe line 3--3 of Fig. 2

and showing in detail one of the slip-drives associated with the paperclamp; t

Fig. 4 is an enlarged sectional view taken substantially along the line'4-'- 4 of Fig. 3 and showing the various parts thereof when both theknife bladeand paper clamp are positioned above the work at the top oftheir stroke;

' Fig. 4a is a similar sectional view wherein the various parts areshown at an intermediate step in the operation of the paper cutter;

Fig. 5 is an enlarged sectional view taken substantially along the line5--5 of Fig. 1 and showing the details of the ovenoad device and clutchin the driving mechanism;

Fig. 6 is an enlarged sectional view taken substantially along the line6-6 of Fig. 1 and showing details of the brake and stopping cam in theone-revolution device associated with the driving mechanism;

Fig. 7 is a sectional view taken substantially along the line 1-1 ofFig. 6 and showing details of the positive stop and stopping cam;

Fig. 8 is an enlarged sectional view taken substantially along the line8-8 of Fig. 1 and showing the device employed to start operation of theclutch;

Fig. 9 is a sectional view taken substantially along the line 99 of Fig.8;

Fig. 10 is an enlarged sectional view taken substantially along the linel8-l6 of Fig. 1;

Fig. 11 is an enlarged sectional view taken substantially along the lineH-Il of Fig. 1 and showing details of the operating members foractuating the positive stop and brake; and

Figs. 12 through 18 are line diagrams showing schematically from theside and front successive relative positions of the various elements ofmy paper cutter at different stages of operation.

Referring now to the drawings, and more particularly to Figs. 1 through11, the paper cutter 26 comprises basically a supporting frame 2| onwhich all the various elements are mounted, to wit: a driving mechanism22 which motivates both the knife blade 23 and the clamp drivingmechanism 24, a clamp 25, a paper bed 26, and other auxiliary devicesusually associated with a power-driven paper cutting machine.

The supporting frame The supporting frame 2| comprises a heavy, massivebase 28 on either side of which are integrally formed ponderous verticalstandards 30 terminating in specially formed upper ends 32 to which arebolted the side pieces 34 forming the upper portion of the machine. Theside pieces are held in properly spaced relationship by a horizontallypositionedcasting 36. The various portions of the supporting frame aresuitably apertured and formed, as will be hereinafter set forth indetail, to receive and carry the several operating devices to bedescribed. The overall dimensions of the supporting frame, however, mustbe such that the same is capable of being passed through a standarddoorway of a building.

The driving mechanism Any suitable source of motive power, for examplean electric motor or a rotating power shaft (not shown), is employed todrive a belt 38 which engages the circumference of a fly wheel 40. Thefly wheel is disposed substantially centrally of the standards 30 (asviewed from the side of the machine), being rotatably supported on adrive shaft 42 which is journalled in the said standards and projectsbeyond the same.

To mount the fiy wheel 40 in this manner I provide a sleeve 44 having atone end thereof a flange 46 which is bolted to the fly wheel 40. Theother end of the sleeve is enlarged and cut to provide a gear 48 whichis permanently in mesh with a ear 50. The sleeve 44 and "gear 48 arerecessed to receive a bushing 52 which rotatably engages the surface ofthe shaft 42. The gear 50 has an elongated, hollow hub 54 rotatablyreceived in a journal 56 bolted to the support 2|. A counter-shaft 58which is journalled inside of the hub 54 carries a gear 60 permanentlyin mesh with a ring gear 62 attached to the drive shaft 42. Said countershaft is disposed substantially vertically in line with the drive shaft42 for compactness and accessibility.

It will be seen that when the shaft 58 and gear 58 are caused to rotatetogether, the drive shaft 42 which, actuates the knife blade and paperclamp will be set in operation. To this end the following clutchmechanism. is provided:

The gear 58 is dished out to provide a recess whose side walls act as afriction drum 64 (see Fig. 5). 'Cooperating with this drum 64 are a pairof spring arms 66 integrally formed on a ring 68 which rotates with theshaft 58. The ends 10 of the arms 66 are spaced a short distance awayfrom the friction drum 64 so that when the arms are urged towards thedrum they will engage the latter in heavy frictional contact causing theshaft 58 and gear 50 to turn together.

In order to prevent breakage of parts of the machine in the event of anoverload caused, for example, by inadvertent disposition of a blockunder the descending knife blade, I provid an overload device,preferably kinematically. interposed between the ring 68 and thecounter-shaft 58. Such device comprises a hardened plate 12 keyed to theshaft 58 and provided with a pair of recesses I4. Pivotallymounted on astud i6 projecting from the ring 68 is a cam member 18 comprising arectangular block and wedge 82. During normal driving disposition of theoverload device the face of the rectangular block 80 opposite the wedge82 lies flat against the plane face 84 of a lever arm 86 pivotallymounted by means of a stud 88 on the ring 68. The free end of the lever86 is urged towards the plate 12 by a spring 88 maintained under tensionbetween the lever 86 and a pin 90 fixed to the plate 68. Under ordinarydriving conditions one point of the wedge 82 will lie at the innermostpoint of the recess 14 and thus interconnect the ring 68 andcounter-shaft 58 for rotation. When the load increases, the ring 68 willforge angularly ahead of the plate 12, causing the rectangle 80 torotate in a clockwise direction (as viewed from Fig. 5) about the pivot16 until one face of the wedge lies against a steeply inclined face 92of the recess 14. As a further load is applied the force tending to movethe ring 68 angularly ahead of the plate 12 will rotate the block 80through approximately 90 and cause one of its flat faces 94 to bepresented to the said plate 12. At such time there will be no operativedriving action between the ring 68 and the counter-shaft 58.

The overload device may be reset by simply turning the rectangular block80 in a counterclockwise direction with a suitable tool, such as awrench.

Engagement between the ends Ill of the spring arms 66 and the frictiondrum 64 may be effected by means of a pair of fingers 96 and 98 (Figs.1, 5 and 8) which are pivotally mounted in yokes I68 projecting radiallyfrom the ring 68. The portion of the fingers 86 and 98 adjacent the arms66 is provided with a hump I62 disposed in abutment with the innersurface of said arms. It will thus be seen that when the free ends ofthe fingers are moved outwardly of the countershaft 58 they will cause acorresponding movedisengaged.

. 2,325,030 ment of the arms 66 towards the friction drum66." To bringabout such outward movement of'the fingers 66 and 66 at the beginning ofeach cycle of operations of the paper cutter, and to shift said fingersback to their inoperative position at the end. of a cycle, the followingdevice is provided:

under compression between a'--knurled knob I66 Y atthe free end of the'shaft and a" block I62 fixed I to the upper end of the brake, normallyurges mam A vertically disposed actuating shaft I66 joumalled inbearings I66 and I68 fixed to thesupporting frame'2l. On the lower endof said shaft are mounted a-pair of spaced fingers H and H2 (see Figs. 8and 9) each having a pin II6 which is slidably received in an annular.

groove H6 in a cone-shaped member II6 slidably mounted on thecountereshaft'fl. Said cone-shaped member lil is, centrally disposedbetween the fingers 96 and 66; so that when the shaft I06 is rotated ina counterclockwise direction (as viewed from Fig. 8) the member Illvwill engage the fingers 66 and 66 to spread the thesaid brake band to abraking nositiom. The rod I26 which forms part of the two-handed safetyoperating device passes between the block .llland'the supporting frame2|; Saidrod I26 has a named projection I66 which, when the. actuatingshaft'is oscillated for operation of the a knife, urges the brake block162 away from the, supporting frame 2I todisengage the brak band- I62from the outer surface of the ring gear .62;

when engagemeneof the roll'erIIl and cam I36 endsacuttingcycle the camI66 and block is: to' permit'the brake to quickly'bring-thedrive'shaft 62 to a dead stop.

Means. may. also be provided to positively stop I I the machlnein the.event of failure of the, brake band I62. Suchnmeans may-comprise a pairof same apart and consequently'causeengagement,

I between the spring'arms 66 and frictiondrum'66.

The actuating shaft I06 is normally caused. to rotate in a direction tobegin operation of a- I22 normally lies in the path of a translatablerod I2B(see Figs. 1 and 11) which is slidably mounted on the supportingframe 2I and which is positively moved through a link I28 by theactuating shaft I06. It will be seen that it is thus necessary to movethe lever I22 in a counterclockwise direction (as viewed from Fig. 1)

,.before the handle I20 may be manipulated to start a cutting cycle. v

When the operating handle 920 is moved to rotate the actuating shaft I06at the beginning of a cutting cycle, a rocker arm H30 (see Fig. 10)affixed to said shaft willjshift a link i32, interconnecting said armand a rod mounted on the supporting frame 28.; A roller I36 (see Figs. 6and '1) carried by the rod 836 will then be positioned in the path of acam H6 projecting from the inner surface of the ring gear 62. The rollerI36 when first placed in the path of travel of the said cam I36 isspaced angularly.

slightly less than 360 from the sloped working face I60 of the cam.After an almost full revolution of the driving shaft 62 and ring gear62, the said cam will approach the roller I66 as shown in Figs. 6 and 7and. then force said roller and associated rod I36 towards the actuatingshaft I06 to rotate said shaft back to its inoperative I36 slidablyspaced lugs I66 and I66 which are angularly positioned afewdegrees'beyond the cam I ll.

These lugs are adapted to be engaged by an abutment. member I60projecting from a lever I62 wards the center of the knife stock for areason position with the cone-shaped member He retracted from thefingers 66 and 96 and the clutch Due to the considerable momentum of themassive driving and operating parts, a hr'akeis provided to bring themachine to a quick stop. Such brake comprises an ancuate brakeba d I62which engages the outer surface of the ring gear 62. Said brake band ispivotally connected at its lower end by means of a stud I tothesupporting frame 2| and is slidably mo ted at its upper end on a shaftI66 threadedly received in the said supporting frame. A spring I66,maintained having'one endthereof pivotally mounted on a stud l66'projecting from thesupporting frame 2| and the other end thereof pinnedto the rod I26; so'that movement of the roller I36 upon,

completion of a cutting cycle will cause corresponding movement of theabutment member I60 to position the same between the said lugs I56 andThe knife and associated structure Pinned to the projecting ends of thedrive shaft 62 are cranks I66 having crank .pins on which are rotatablyjournalled oneend of substantially vertical connectingfrods I66.

. The upp r end of each of the connecting rods is pivoted to an arm I10rotatably supported, in a manner soon to be described, inthe paper clampactuating mecha- 1 nism 26.

The forward ends of the arms I10 are formed into a ball I12 which isreceived in split-socket shoe I16 slidably disposed in slots I16 and I16in the knife stock I66. One slot I16 is horizontal and the other slotI18 inclined downwardly. to-

which will soon be apparent.

At the end of the indie stock I60 in which the I inclined slot I16 ispositioned there i also provided a pin I62 which pivotally carries ashoe I66 slidably disposed in an inclined channel I86 cut in aprojection I 66 extending from the side iece 36. The knife 23, which issupported athe lower edge of the'knife stock I80, is slightly inclinedin its uppermost'position (shown in Fig; 1) so that ,the left hand endis lower than its right hand. end. When the shaft 62 is rotated in acutting cycle both connecting rods I66 will move downwardly at the samerate of speed. The left hand side of the knife blade will descend at thesame rate of travel as the upper end of the left hand connecting rodI66. However, when the right hand side of the knife stock iscaused tomove down, due to cooperation between the shoe I66 and channel I66, saidknife stock will be shifted towards the left. At the same time the knifestock will be shifted downwardly because of cooperation between theright hand shoe I16 and inclined slot I16. This will cause the righthand side of the knife stock to move down more rapidlythan the left handside of the knife stock, and thus change the angular inclination of theknife blade 23 during cutting, as is desirable Y movement of the lever Iis in a downward or upward direction, and no pressure will be exertedupon the guide channels I92 in the side pieces 84.

By virtue of this construction once the side pieces 34 have beenproperly aligned to place the knife stock I80 and knife blade 28 insquare with the paper bed, no deviation insquareness will result; fromwear of the channels I82 or adjacent surface of the knife stock I80;

It will also be seen that the shifting and oscillating movement of theknife stock I80 is mparted by connecting rods I68 having identical ratesof travel. This is of considerable importance, since, as will soon beapparent, such uniform movement of the connecting rods is necessary touniformly drive both ends of the paper clamp.

The paper c'lamp and actuating mechanism The paper clamp 25 is disposedimmediately behind the knife stock I80, being slidably received' inchannels I96 in the side pieces 34 (see Figs. 2 and 3)-. Each end of theclamp has extending therefrom a pin I98 which is lournalled in a shoe200 slidingly disposed in a yoke 202 extending from the paper clampactuating mechanism 24. Said yoke forms an integral extension of afriction drum 204 which is keyed to a clamp counter-shaft 206 rotatablymounted on the side pieces 34. The friction drum 204 is provided with acentral hub 208 which surrounds the counter- .shaft 206 and whichrotatably receives a collar 2I0 integral with and projecting from thearm I10 so as to journal said arm on the paper clamp actuatingmechanism.

Extending out from the collar 2I0 is a circular flat 2I2 having aperipheral flange 2" provided with a pair of oppositely disposed groovesH6. The flange 2 is spaced from the inner surface of the friction drum204 and in the annulus thus provided there are disposed a pair ofresilient friction shoes 2I8. Legs 2I8 integrally formed at the ends ofthe shoes 2I8 project into the grooves 2I6, said grooves and legs beingso proportioned that a slight clearance exists (exaggerated in Figs. 4and 4a) between the said legs and grooves. The shoes 2 I 8 are alwaysmaintained in frictional engagement with the inner periphery of thebrake drum 204 by spring clips 220 inserted between the flange 2 I 4 andthe shoes 2I8. and brake drum 204 are maintained may be varied bymanipulation of bolts 222 threadedly received in the flange 2I4. Thespring members 2I8 are kept in place and dust and foreign matterprevented from entering into the clutch actuating mechanism 24 by acover 228 which is hingediy supported on the lever I 10 and abutsagainst the outer edge of the circular peripheral flange on the frictiondrum 204. If desired, paper clamp actuating mechanisms 24 may bedisposed at both ends'of the counter-shaft 206 as shown. A counterweight224 balances all but a few pounds of theweight of the paper clamp 25 andthe driving mechanism therefor.

In the operation of the clamp actuating device I 24 when the paper clamp25 is disposed at its' The pressure under which the shoes 2I8- similarmovement to the yoke through the flange 2, spring 220, shoes 2I8 andfriction drum 204. At such time the friction drum 204 wlllmove at thesame rate of rotation as the arm I10,.or possibly slightly faster, underthe influenceof the weight of the clamp. This will continue until theclamp has reached the uppermost web of paper to be out. As the lever armI10 then continues to move downwardly the paper stock will firstcompress slightly under the driving action derived only throughfrictional engagement between the shoes 2I8 and the friction drum 204caused by the spring clips 220. When, however, as the lever I10 movesfurther downwardly the shoes 2I8 begin to slip against the friction drum204, the legs 2I9 thereof will engage one side of the recess 2I6 (asshown in Fig. 4a) to cause the adjacent surface of the resilient shoes 2I8 to tend to expand and be strongly urged against the friction drum204. This increased pressure will cause the paper clamp to be moretightly pressed against the paper stock. When the paper has beencompressed the full amount permissible by frictional engagement betweenthe shoes 2I8 and friction drum 204 under the influence of the legs 2|9,the shoes 2I8 will slide relative to the drum throughout the remainingstroke of the connecting rods I68, during which cutting is performed. 0nthe return movement of the knife blade and connecting rods thefrictional engagement between the shoes 2I8 and the friction drum 204will suffice to raise the paper clamp.

A stationary stop 230 (shown' only schematically in Figs. 12-15) may beprovided to limit the upward movement of the paper clamp and allowrepositioning of the elements of the paper clamp actuating mechanism 24to their relative positions shown in Fig. 4, where they are ready forinitiation of another cutting cycle.

The paper bed and other auxiliary devices The paper bed 26 is bolted tothe supporting frame 2| and may be supplementally supported, as isusual, by braces at the rear thereof. Any auxiliary equipment, such asis usually found in machines of this character, may be provided, as forexample the hand wheel 226 and scale 228 for moving and determining theposition of the paper back stop 225. The said paper bed, however, andany device or equipment associated therewith which do not lie within theconfines of the base 28, may belreadily detached without affecting thesupport or operation of the driving and actuating mechanisms hereinabovedescribed, thus permitting the machine to be quickly readied for passagethrough a narrow doorway at least the width of the smallest dimension ofthe base 28.

Correlated operation of the knife blade and paper clamp In Figs. 12through 18 there are schematically illustrated in line drawings therelative positions of the knife blade, paper clamp and actuatingmechanisms therefor at certain stages of their operation. Figs. 12through 15 show such elements from the side, and Figs. 16 through 18show such elements from the front. The latter group of figures isemployed to illustrate the laterally shiftable and swinging motion ofthe knife blade. In all these figures the same reference numerals whichwere employed to describe parts in Figs. 1 through-11 will be used inreferring to the line representations of the same elements.

In Fig. 12 the parts are illustrated at the beginning of a cuttingcycle. It will be noted that the yoke 202 leads the lever by a fewdegrees. This is to insure that the clamp 25 will strike the paper stockP before the knife blade-23 regardless of the height of the said paperstock. It will also be noted that the lowermost point of the knife blade23 corresponding to the portion of the blade at the extreme left of themachine (as viewed from Fig. 1) is slightly higher, on the order ofapproximately one-half an inch, than the lowermost surface of the paperclamp.

In Fig. 13 the parts are shown after the paper clamp has moved downtoengage the uppermost capacity at the arm I by the same amount as atthe beginning of the cutting cycle. Also the end of the arm I10 whichcorresponds to the shoe I14 has moved forward relative to the knifestock and thereby piece, of'paper stock P,'and has compressed the paperstock to-the limit of its existing setting of the bolts 220. At such.time it will be seen that the yoke 202 is still leading the preventedexertion of lateral pressure on the 1 channels in which the knife stockslides.

Fig. 14 illustrates the parts after the knife has completed its cuttingstroke but before the return thereof. It will be seen'that'between theposition illustrated in Figs. 13 to 14 the paper clamp 25 and yoke 202haveretained their relative positioning with respect to the paper stockP, paper bed 26 and paper clamp actuating mechanism 24, while the leverI10 and connecting rod I66 continued to move throughouttheir full stroketo bring the knife blade 23 down to the level of the paper bed'26. 'Atsuch time the lower edge of the knife blade has moved past th lowersurface of the paper clamp and the lever I10 has moved towards, and,according to the design of parts as illustrated herein, angularly pastthe yoke 202.

, After the cutting stroke is completed the crank pin I66 will rotateback towards its starting position and in so doing urge the paper clamp25 and knife blade 23 upwardly. During its return stroke the yoke 202will angularly'lead the lever "0 due to the'relative positioning of thesaid parts at the end of the cutting stroke (as shown in Fig. 14).However, when the paper clamp 25 been able to minimize the number ofparts emchannel I'I8 than it was at the start of the knife stock, willhave moved the right hand end of the knife stock down a slightly greaterdistance than the left hand end of the knife stock, so that the knifeblade will 'now be less steeply inclined upwardly from left to right.

At the end of the cutting stroke of the knife stock all the shoes willbe moved to the end of the channels opposite that in which they werepositioned in Fig. 16, and the right hand end of the knife stock willhave traveled 'a distance sufficiently greater than the left hand end ofthe knife stock to make the knife blade lie parallel I to the paper bed26. It will be apparent, therefore, that the swinging and lateralshifting motion which is known to be desirable in this field has beenimparted to the knife stock by connecting rods moving at the same rateof speeds and the said connecting rods may therefor be used to actuateboth ends of the paper clamp 25.

General attributes It will be seen that -by driving the paper clampactuating mechanisms from the'connecting rods, I am able to place suchmechanisms at the sides of the paper cutter where they are readilyaccessible for inspection, replacement or repair, or for adjustment ofthe bolts 222 in the event that the degree of pressure of the paperclamp is desired, to be varied. In this manner I have also ployed fordriving the paper clamp and to reduce their size.

It will also be appreciated that the driving mechanism, including theone-revolution driving device, is disposed in the base of the ma.-

' chine, and being free from the paper clamp actureaches the upper limitof its stroke, as shown in Fig. 12, it will abut against the stop 230(Fig. 15). As the connecting rod I68 continues to move up: wardly thelever I10 and knife blade 23 will be raised while the paper clampremains stationary until the'various parts of the clamp actuatingmechanism 24 are repositioned and are ready to commence another cuttingcycle.

Figs. 16 through 18 show the knife stock I80 and knife blade 23 inpositions corresponding approximately to those illustrated in Figs. 12

through 14. I

In Fig. 16 the drive shaft 42, cranks I66 and connecting rods I68 havepositioned the knife stock I80 at'the uppermost part of .its stroke. Atsuch time the left hand shoe -I'I4 will be at the extreme left hand endof the left hand slot I16 while the right hand shoe1I'I4 will be at theextreme left hand end of the right hand,

.slot I18.

Also, the shoe I84 which is pivoted on stud I82 attached to the knifestock I80 will be at the upper end of the inclined channel I86.

- The cutting edge of the knife blade at this time is inclineddownwardly from right to left. When the drive shaft 42 has moved thecranks and connecting rods downwardly to position the knife atingmechanism is accessible from both sides for inspection, replacement orrepair. Moreover,

' same through an ordinary siz'e door thereof without-the necessity ofbreaking down the wall of the building or disassembling the drivingmechani-sm on the street. Due also to the positioning of the drivingmechanism wholly within the supporting frame, a mechanic fixing themachine will not be required to work in cramped or dangerous positionsas was' heretofore the case when portions of the driving mechanism weredisposed behind the base and below the paper bed.

It will thus be seen that there is provided a device in which theseveral objects of this invention are achieved, and which is welladapted to meet the conditions of practical use.

As various possible embodiments might be made 'of the above invention,and as various changes might be made in the embodiments.

above-set forth, it is to be understood that all matter herein set forthor shown in the accom- "supportedon said frame, a driving member forsaid knife blade journalled on said frame above said bed, means toactuate said driving member, a driving member for said paper clampjournalled on said'frame above said bed, an impositive driving traindirectly interconnecting said driving members, a drive shaft, and meansto actuate one of said driving members from said drive shaft.

2. In combination in a power-driven paper cutter having a paper bed, asupporting frame, a reciprocable knife blade slidingly supported on saidframe, a reciprocable paper clamp slidingly supported on said frame, adriving member for said knife blade journalled on said frame above saidbed, means to actuate said driving member, a driving member for saidpaper clamp journalled coaxially with said knife blade driving member,an impositive driving train directly in- 1 ter-connecting said drivingmembers, a drive shaft,-

and means to actuate one of said driving members from said drive shaft.I

3. In combination in a power-driven paper cutter having a paper bed, asupporting frame, a reciprocable knife blade slidingly supported on saidframe, a reciprocable paper clamp slidingly supported on said frame, adriving member for said knife blade journalled on said frame above saidbed, means to actuate said driving member,

a driving member for said paper clamp journailed coaxially with saidknife blade driving member, a friction slip drive directlyinterconnecting said driving members, a drive shaft, and means toactuate one of said driving members from said drive shaft.

4. In combination in a power-driven paper cutter having a paper bed, asupporting frame, a reciprocable knife blade slidingly supported on saidframe, a reciprocable paperclamp slidingly supported on said frame, adriving member for said knife blade journalled on said frame above saidbed, means to actuate said driving member, a driving member for saidpaper clamp journalled coaxially with said knife blade driving member,a. friction slip drive interconnecting said driving members, a driveshaft, and means to actuate one of said driving members from said driveshaft said friction slip drive comprising a friction drum rotatable withone of said members, a friction shoe rotatable with the other of saidmembers and coacting with said friction drum, means to press saidfriction drum and friction shoe together and means to increase thepressure between said friction drum and said friction shoe when thedownward progress of said paper clamp is impeded.

5. In combination in a power-driven paper cutter having a paper bed, asupporting frame, a' reciprocable knife blade slidingly supported onsaid frame, a reciprocable paper clamp slidingly supported on saidframe, a driving member for said knife blade journalled on said frameabove said bed, means to actuate said driving member, a driving memberfor said paper clamp journalled coaxially with said knife blade drivingmember, a drive shaft, and means to actuate one of said driving membersfrom said drive shaft a friction slip drive interconnecting said drivingmembers, said friction slip drive comprising a friction drum rotatablewith one of said members, a pair of spaced walls rotatable with saidother member, a friction shoe having a leg angularly disposed relativeto the frictional surface of said shoe and loosely received between Isaid walls and means to press said friction shoe and friction drumtogether.

6. In combination in a power-driven paper cutter having a paper bed, asupporting frame, a reciprocable knife ,blade slidingly supported onsaid frame, a reciprocable paper clamp slidingly supported on saidframe, a pair of driving members for said knife blade journalled onopposite sides of said frame above said bed, a pair of identicallyoperating means to separately actuate said driving members, a pair ofdriving members for said paper clamp each of which is associated andjournalled coaxially with knife blade driving driving members and saidknife blade driving members in predetermined relative position at thebeginning of each working stroke of said paper cutter.

7. In combination in a power-driven paper cutter having a paper bed, asupporting frame, a reciprocable knife blade slidingly supported on saidframe, a reciprocable paper clamp slidingly supported on said frame, apair of driving members for said knife blade journalled on oppositesides of said frame above said bed, a pair of identically operatingmeans to separately actuate said driving, m embers, a pair of drivingmembers for said paper clamp each of which is associated and journalledcoaxially with knife blade driving members on opposite sides of saidframe, a shaft interconnecting said paper clamp driving members forcommon rotatable movement, and a pair of driving trains disposed onopposite sides of said frame for interconnecting each of said knifeblade driving members with its associated paper clamp driving member,said driving trains including means to permit relative angular movementbetween each of said knife blade driving members and its associatedpaper clamp driving member.

8. In combination in a power-driven paper cutter having a paper bed, asupporting frame, a reciprocable knife stock slidingly supported on saidframe, a reciprocable paper clamp slidingly supported on said frame, apair of driving members for said knife stock journalled on oppositesides of said frame abov said bed, a pair of identically operating meansto separately-actuate said driving members, a pair of driving membersforsaid paper clamp each of which is associated and journalled coaxiallywith knife stock driving members on opposite sides of said frame, ashaft interconnecting said paper clamp driving members for commonrotatable movement, a pair of driving trains disposed on opposite sidesof said frame for interconnecting each of said knife stock drivingmembers with its associated .paper' clamp driving member, one of.

said knife stock driving members being slidably received in asubstantially horizontal elongated slotin said knife stock, the other ofsaid driving members being slidably received in an inclined elongatedslot in said knife stock, and means to shift said knife stock laterallyas said knife stock is vertically reciprocated whereby said knife stockis both laterally shiftedand swung as it is vertically reciprocated.

and horizontal.

. openingsin said knife stock.

9. In combination in a power-driven paper identically operating means'toseparately actuate said driving members, a pair of driving mem bers forsaid paper clamp each of which is associated and journalled coaxiallywith'knife stock driving members on opposite sides of said frame,

'- a shaft interconnecting said paper clamp driving members for commonrotatable movement, a pair of driving trains disposed on opposite sidesof said frame for interconnecting each of said knife stock drivingmembers with its associated paper clamp driving member, one of saidknife stock driving members being slidably received in a substantiallyhorizontal elongated slot in said knif stock, the other of said drivingmembers being slidably received in an inclined elongated slot in saidknife stock, and means to'shift seid knife stock laterally as said knifestock is vertically reciprocated, said last named means comprising apair of relatively slidable members, one of said last named pair ofmembers being associated with said knife stock and the other of saidlastnamed members-being associated with said supporting frame whereby saidknife stock is both laterally shifted and swung as it is verticallyreciprocated, one of said last named pair of members being inclined tothe vertical 10. In combinationin a power-driven paper cutter having apaper bed, a supporting frame,

a' reciprocable knife stock slidingly supported I, on said frame, areciprocable paper clamp slida resettable overload device kinematicallyinteringly supported on said frame, a pair of "driving members for saidknife stock journalled'on opposite sides of said frame above said bed, apair of identically operating means to separately ac tuate said drivingmembers, a ,pair of driving members for said paper clamp each of whichis associated and journalled coaxially with knife stock driving memberson opposite sides of said frame, a shaft interconnecting said paperclamp driving members 'forcommon rotatable move ment, and a pair ofdriving trains disposed on opposite sides of said frame forinterconnecting 'each of said knife stockdriving members with itsassociated paper clamp driving member, said comprising a drive shaft,means to receive motive power, said last named means being rotatablymounted on said drive shaft, and a clutch intermediate said drive shaftand said power receiving means to optionally cause said drive shaft andsaid power receiving means'to simuitaneously rotate; I Y

13. In combination in a power-driven-paper cutter having a paper bed, asupporting frame,

a reciprocable knife blade slidingly supported on said frame, areciprocable paper clamp slidingly supported on said frame, meanssupported on said frame above said bed to actuate said paperclamp, andmeans supported on said frame below said bed to drive said knife bladeand said-paper .clamp actuating means, said last named means including adrive shaft on which is rotatably mounted means to receive, motivepower, a coun- I tershaft operatively connected to said drive shaftported on'said frame,- a reciprocable paper clamp slidingly supported onsaid frame, a single means to actuate both said paper clamp and .saidknife blade, means to "drive said actuating means, and

'a resettable overload device kinematicallyintermediate said actuatingmeans and said driving means.

frame, a recipro'cable knife blade slidingly sup-' ported on said frame,means to actuate said knife blade, means to drive said actuating means,and

means.

'16. In combination in a power-driven paper cutter of the characterdescribed, a supporting frame, a reciprocable knife blade slidinglysupported on said frame, a reciprocable paper clamp slidingly supportedon said frame, means to actuate said paper clamp and said knife blade,

-' means to drive said actuating means,said last driving members forsaid knife stock being slid- I ably received in, front-to-backdirectionin 11. In combination in a power-driven paper cutter having apaper. bed, a supporting frame, a reciprocable knife stockslidingly-supported on 1 saidframe, a pair ofdrivingmembers for saidknife stock journalled'on oppositesides of said frame above saidbed' forrotation-,about an axis perpendicular to theldirection of movement ofsaidknife-stock, and means to actuate saidjdriving members, said drivingmembers being slid- I .a-bly "received in a front-to back direction inopenings-in said knife stock.

12. In combinationfin a power-driven paper cutter having'a paper bed, asupporting frame,

a reciprocable knife blade slidinglysupported on said frame, areciprocable paper clamp slidingly supported on said frame, meanssupported on said frame above said bed to actuate said paper named-meanscomprising a gear train and a clutch member, one of the gears in saidtrain being recessed, the recess thus provided being coaxial with saidgear, said clutch being disposed in said recess and cooperating with awall thereof.

1'7. In' combination -in a power-driven paper cutter of the characterdescribed, a supporting frame, a drive shaft journalled in said frame, a

pair of spaced cranks fixed for rotation with said drive shaft, a,rec'iprocable knife blade slidingly supported on said frame, connectingrods-interconnecting said cranks and theopposite ends or said knifeblade, power receiving means mounted.

for rotation about said shaft between said cranks,

and a power transmitting train, including a clutch, intermediate said'power receiving means and said drive'shaft. v. l 1 L 18. In combinationin a power-driven paper cutter of the'character described, a supportingc1amp,-and means supported on said frame below 7 said bed to drive saidknife blade and said paper clamp actuating means, said last-named meansframe, a drive shaft journalled in said frame, a pair of spaced cranksfixed for rotation with said a gear train, including a clutch,intermediate said circular member and said drive shaft.

19. In combination in a power-driven paper cutter having a bed,a'supporting frame, a reciprocable knife blade slidingly supported onsaid frame, a reciprocable paper clamp slidingly supported on saidframe, a pair of similar means supported on said frame above said bed toactuate said paper clamp, a drive shaft journalled insaid frame, a pairof spaced cranks fixed to said drive shaft for rotation therewith, aconnecting rod interconnecting each of said cranks with one end of saidknife blade and with one of said paper clamp'actuating means, powerreceiving means mounted on said shaft between said cranks for rotationthereabout, and a power transmitting train, including a clutch,intermediate said power receiving means and'said' 1 ment of the clampwith paper to be cut, and the greater degree of engagement beingeffective when contact with said paper prevents movement of said clamp.

21. In combination in a power-driven paper cutter having a paper bed, asupporting frame,

a reciprocable paper clamp slidingly supportedon said frame, andfrictional, automatic, pressure changing means rotatably supported onsaid frame above said bed to actuate said clamp.

22. In combination in a power-driven paper cutter of the characterdescribed, a supporting frame, a reciprocable knife stock slidinglysupported on said frame, a pair of driving members for said knife stockreciprocably mounted on opposite sides of said frame, means toidentically reciprocate said driving members, one of said drivingmembers being connected to said knife blade in such manner as to permithorizontal movement of said knife blade relative thereto, the other ofsaid driving members being connected to said knife blade in such manneras to permit movement of said knife blade relative to said other memberin a direction slightly inclined to the horizontal and means to shiftsaid knife blad laterally as said knife driving membersare reciprocatedvertically.

23. In combination in a power-driven paper cutter, a paper bed, asupporting frame, a reciprocable knife blade slidingly supported on saidframe, a reciprocable paper clamp slidingly supported on said frame, adrive shaft, means to rotate said drive shaft, a power transmittingtrain actuated by said drive shaft, said train having a reciprocablydriven member disposed above said paper bed and at a side of saidcutter, means actuated by said member to drive said blade, and separatemeans also actuated by said member to drive said paper clamp.

24.'In combination in a power-driven paper cutter a paper bed, asupporting frame, a reciprocable knife blade slidingly supported on saidframe, a reciprocable paper clamp slidingly supported on said frame, adrive shaft, means to rotate said drive shaft, a pair of powertransmitting trains actuated by said drive shaft, said trains beingspaced laterallyof said cutter, each of said trains having areciprocably driven member disposed-above said bed, said members beinglocated on opposite sides of said machine, a pair of means for drivingsaid knife blade, each of said knife blade driving means being actuatedby one of said members and being operatively connected to an end of saidknife blade, and 'a pair of means for driving said paper clamps, each ofsaid paper clamp driving means being actuactuated by said drive shaft,said trains being spaced laterally of said cutter, each of said trainshaving a reciprocably driven member disposed above said bed, saidmembers being located on opposite sides of said machine, a pair of meansfor driving said knife blade, each of said knife bladedriving meansbeing actuated by one of 'said members and being operatively connectedto an end of said knif blade, a pair of means for driving said paperclamps, each of said paper' clamp driving means being actuated by one-ofsaid members and being operatively connected to an end of said paperclamp, said knife blade 'driving means and said paper clamp drivingmeans being simultaneously actuated by the said members of the saidpower trains.

26. In combination in a power-driven paper cutter, a paper bed, asupporting frame, a reciprocable knife blade slidingly supported on saidframe, a reciprocable paper clamp slidingly supported on said frame, adrive shaft, coaxial means to rotate said drive shaft, a pair of powertransmitting trains actuated by said drive shaft, said trains beingspaced laterally of said cutter, each of said trains having anoscillatably driven member disposed abovesaid bed, said members beinglocated on opposite sides of said. machine, a pair of means for drivingsaid knife blade, each of said knife blade driving means being actuatedby one of said members and being operatively connected to an end of saidknife blade, a pair'of means for driving said paper I clamps, each ofsaid paper clamp driving means being actuated by one of said members andbeing operatively connected to an end of said paper clamp, said knifeblade driving means and said paper clamp driving means beingsimultaneously actuated by the said members of the said power trains.

27. In combination in a power-driven paper cutter, a paper bed, asupporting frame, a reciprocable knife blade slidingly supported on saidframe, a reciprocable paper clamp slidingly supsaid imposltive means fordriving saidpaper clamp.

28. In combination cutter, a paper bed, rocable knife blade slidinglysupported on said frame, a reciprocable paper clamp slidingly supportedon said frame, a drive shaft, means to rotate said drive shaft, adriving member for said paper clamp, said member being disposed abovesaid bed and at a side of the cutter, a driving member for said knifeblade, said knife blade driving member being disposed above said bed andat a side of the cutter, means kinematically interconnecting said paperclamp driving member and knife by said paper clamp driving memberderives its power from said'knife blade driving member, saidinterconnecting means including an impositive driving means andcomprising a power transmitting mechanism that reduces the amount ofpower transmitted when the clamp is halted on its return stroke to thatrequired to control the weight of the clamp.

29. In combination in a power-driven paper cutter of the characterdescribed, a supporting frame, a reciprocable knife stock slidinglysupported in said frame, a pair of driving members for said knife stockreciprocably mounted on opposite sides of said fame, and means toidentically reciprocate said driving members, one of said drivingmembers being slidably received in a horizontal slot which is disposedadjacent an end of said knife stock and extends partially thereacross,the other of said driving members being slidingly received in an obliqueslot which in a power-driven paper is adjacent to the other end of saidknife stockand extends partially thereacross, and means to shift saidknife blade laterally as said driving members are reciprocated.

30. In combination in a power-driven paper cutter of the characterdescribed, a knife, a pair of spaced members of even throw to verticallyreciprocate said knife, and means to swing said knife about a horizontalaxis perpendicular thereto and adjacent an end thereof as it verticallyreciprocates.

31. In combination in cutter of the character frame, a'drive shaft, 9.even throw fixed for. rotation with a power-driven paper described, asupporting pair of spaced cranks of blade driving member where-' asupporting frame, a re'cipshaft, a reciprocable knife blade slidinglysupported on said frame, means driven by said cranks for reciprocatingsaid knife blade, power receiving means coaxial with and mounted forrotation about said shaft between said cranks, and a power transmittingtrain kinematically intermediate said power receiving means and saiddrive shaft, said train including an automatic overload release clutch.

32. In combination in a power-driven paper cutter of the characterdescribed, a supporting frame, a drive shaft, a pair of spaced cranks ofeven throw fixed for rotation with said drive shaft, a reciprocableknife blade slidingly supported on said frame, means driven by saidcranks for reciprocating said knife blade, power receiving means coaxialwith and mounted for rotation about said shaft between said cranks,

and a power transmitting train kinematically intermediate said powerreceiving means and said drive shaft, said train including a reductiongear drive, an automatic resettable overload release and a clutch. l I

33. In combination in a power-driven paper cutter of thecharacterdescribed, a knife stock mounted for reciprocation, a paperclamp mounted for reciprocation parallel to the knife stock, a pair ofmembers, and an imposltive power transmitting mechanism directlyconnecting said said drive so 3 members, one of said members drivingsaid mechanism and the other of said members being driven by. saidmechanism, said knife stock being actuated by said driving member, andsaid clamp being actuated by said driven member.

34. In combination in a power-driven paper cutter of the characterdescribed, a knife stock mounted for reciprocation, a paper clampmounted for reciprocation parallel to the knife stock, and'an impositivepower transmitting mechanism comprising a pair of coaxially rotatablemembers and friction means tending to prevent relative rotation thereof,each of said members rigidly carrying an arm, one of said'arms beingadapted I to drive said imposltive means from a source of power and theotherof said arms being adapted to be driven by said imposltive means,said knife stock being actuated by said driving arm, and

said paper clamp being actuated by said driven arm.

OSCAR BELLAR.

